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669a5db4 JG |
1 | /* |
2 | * pata_sl82c105.c - SL82C105 PATA for new ATA layer | |
3 | * (C) 2005 Red Hat Inc | |
4 | * Alan Cox <alan@redhat.com> | |
5 | * | |
6 | * Based in part on linux/drivers/ide/pci/sl82c105.c | |
7 | * SL82C105/Winbond 553 IDE driver | |
8 | * | |
9 | * and in part on the documentation and errata sheet | |
16728da9 AC |
10 | * |
11 | * | |
12 | * Note: The controller like many controllers has shared timings for | |
13 | * PIO and DMA. We thus flip to the DMA timings in dma_start and flip back | |
14 | * in the dma_stop function. Thus we actually don't need a set_dmamode | |
15 | * method as the PIO method is always called and will set the right PIO | |
16 | * timing parameters. | |
669a5db4 | 17 | */ |
85cd7251 | 18 | |
669a5db4 JG |
19 | #include <linux/kernel.h> |
20 | #include <linux/module.h> | |
21 | #include <linux/pci.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/blkdev.h> | |
24 | #include <linux/delay.h> | |
25 | #include <scsi/scsi_host.h> | |
26 | #include <linux/libata.h> | |
27 | ||
28 | #define DRV_NAME "pata_sl82c105" | |
92ba5d02 | 29 | #define DRV_VERSION "0.3.3" |
669a5db4 JG |
30 | |
31 | enum { | |
32 | /* | |
33 | * SL82C105 PCI config register 0x40 bits. | |
34 | */ | |
35 | CTRL_IDE_IRQB = (1 << 30), | |
36 | CTRL_IDE_IRQA = (1 << 28), | |
37 | CTRL_LEGIRQ = (1 << 11), | |
38 | CTRL_P1F16 = (1 << 5), | |
39 | CTRL_P1EN = (1 << 4), | |
40 | CTRL_P0F16 = (1 << 1), | |
41 | CTRL_P0EN = (1 << 0) | |
42 | }; | |
43 | ||
44 | /** | |
45 | * sl82c105_pre_reset - probe begin | |
cc0680a5 | 46 | * @link: ATA link |
d4b2bab4 | 47 | * @deadline: deadline jiffies for the operation |
669a5db4 JG |
48 | * |
49 | * Set up cable type and use generic probe init | |
50 | */ | |
85cd7251 | 51 | |
cc0680a5 | 52 | static int sl82c105_pre_reset(struct ata_link *link, unsigned long deadline) |
669a5db4 JG |
53 | { |
54 | static const struct pci_bits sl82c105_enable_bits[] = { | |
55 | { 0x40, 1, 0x01, 0x01 }, | |
56 | { 0x40, 1, 0x10, 0x10 } | |
57 | }; | |
cc0680a5 | 58 | struct ata_port *ap = link->ap; |
669a5db4 JG |
59 | struct pci_dev *pdev = to_pci_dev(ap->host->dev); |
60 | ||
c961922b AC |
61 | if (ap->port_no && !pci_test_config_bits(pdev, &sl82c105_enable_bits[ap->port_no])) |
62 | return -ENOENT; | |
9363c382 | 63 | return ata_sff_prereset(link, deadline); |
669a5db4 JG |
64 | } |
65 | ||
66 | ||
669a5db4 JG |
67 | /** |
68 | * sl82c105_configure_piomode - set chip PIO timing | |
69 | * @ap: ATA interface | |
70 | * @adev: ATA device | |
71 | * @pio: PIO mode | |
72 | * | |
73 | * Called to do the PIO mode setup. Our timing registers are shared | |
74 | * so a configure_dmamode call will undo any work we do here and vice | |
75 | * versa | |
76 | */ | |
85cd7251 | 77 | |
669a5db4 JG |
78 | static void sl82c105_configure_piomode(struct ata_port *ap, struct ata_device *adev, int pio) |
79 | { | |
80 | struct pci_dev *pdev = to_pci_dev(ap->host->dev); | |
81 | static u16 pio_timing[5] = { | |
82 | 0x50D, 0x407, 0x304, 0x242, 0x240 | |
83 | }; | |
84 | u16 dummy; | |
85 | int timing = 0x44 + (8 * ap->port_no) + (4 * adev->devno); | |
85cd7251 | 86 | |
669a5db4 JG |
87 | pci_write_config_word(pdev, timing, pio_timing[pio]); |
88 | /* Can we lose this oddity of the old driver */ | |
89 | pci_read_config_word(pdev, timing, &dummy); | |
90 | } | |
91 | ||
92 | /** | |
93 | * sl82c105_set_piomode - set initial PIO mode data | |
94 | * @ap: ATA interface | |
95 | * @adev: ATA device | |
96 | * | |
97 | * Called to do the PIO mode setup. Our timing registers are shared | |
98 | * but we want to set the PIO timing by default. | |
99 | */ | |
85cd7251 | 100 | |
669a5db4 JG |
101 | static void sl82c105_set_piomode(struct ata_port *ap, struct ata_device *adev) |
102 | { | |
103 | sl82c105_configure_piomode(ap, adev, adev->pio_mode - XFER_PIO_0); | |
104 | } | |
105 | ||
106 | /** | |
107 | * sl82c105_configure_dmamode - set DMA mode in chip | |
108 | * @ap: ATA interface | |
109 | * @adev: ATA device | |
110 | * | |
111 | * Load DMA cycle times into the chip ready for a DMA transfer | |
112 | * to occur. | |
113 | */ | |
85cd7251 | 114 | |
669a5db4 JG |
115 | static void sl82c105_configure_dmamode(struct ata_port *ap, struct ata_device *adev) |
116 | { | |
117 | struct pci_dev *pdev = to_pci_dev(ap->host->dev); | |
118 | static u16 dma_timing[3] = { | |
119 | 0x707, 0x201, 0x200 | |
120 | }; | |
121 | u16 dummy; | |
122 | int timing = 0x44 + (8 * ap->port_no) + (4 * adev->devno); | |
123 | int dma = adev->dma_mode - XFER_MW_DMA_0; | |
85cd7251 | 124 | |
669a5db4 JG |
125 | pci_write_config_word(pdev, timing, dma_timing[dma]); |
126 | /* Can we lose this oddity of the old driver */ | |
127 | pci_read_config_word(pdev, timing, &dummy); | |
128 | } | |
129 | ||
669a5db4 JG |
130 | /** |
131 | * sl82c105_reset_engine - Reset the DMA engine | |
132 | * @ap: ATA interface | |
133 | * | |
134 | * The sl82c105 has some serious problems with the DMA engine | |
85cd7251 | 135 | * when transfers don't run as expected or ATAPI is used. The |
669a5db4 JG |
136 | * recommended fix is to reset the engine each use using a chip |
137 | * test register. | |
138 | */ | |
85cd7251 | 139 | |
669a5db4 JG |
140 | static void sl82c105_reset_engine(struct ata_port *ap) |
141 | { | |
142 | struct pci_dev *pdev = to_pci_dev(ap->host->dev); | |
143 | u16 val; | |
85cd7251 | 144 | |
669a5db4 JG |
145 | pci_read_config_word(pdev, 0x7E, &val); |
146 | pci_write_config_word(pdev, 0x7E, val | 4); | |
147 | pci_write_config_word(pdev, 0x7E, val & ~4); | |
148 | } | |
149 | ||
150 | /** | |
151 | * sl82c105_bmdma_start - DMA engine begin | |
152 | * @qc: ATA command | |
153 | * | |
154 | * Reset the DMA engine each use as recommended by the errata | |
85cd7251 | 155 | * document. |
669a5db4 JG |
156 | * |
157 | * FIXME: if we switch clock at BMDMA start/end we might get better | |
158 | * PIO performance on DMA capable devices. | |
159 | */ | |
85cd7251 | 160 | |
669a5db4 JG |
161 | static void sl82c105_bmdma_start(struct ata_queued_cmd *qc) |
162 | { | |
163 | struct ata_port *ap = qc->ap; | |
164 | ||
8361cd79 | 165 | udelay(100); |
669a5db4 | 166 | sl82c105_reset_engine(ap); |
8361cd79 | 167 | udelay(100); |
85cd7251 | 168 | |
669a5db4 JG |
169 | /* Set the clocks for DMA */ |
170 | sl82c105_configure_dmamode(ap, qc->dev); | |
85cd7251 | 171 | /* Activate DMA */ |
669a5db4 JG |
172 | ata_bmdma_start(qc); |
173 | } | |
174 | ||
175 | /** | |
176 | * sl82c105_bmdma_end - DMA engine stop | |
177 | * @qc: ATA command | |
178 | * | |
179 | * Reset the DMA engine each use as recommended by the errata | |
180 | * document. | |
181 | * | |
182 | * This function is also called to turn off DMA when a timeout occurs | |
183 | * during DMA operation. In both cases we need to reset the engine, | |
184 | * so no actual eng_timeout handler is required. | |
185 | * | |
186 | * We assume bmdma_stop is always called if bmdma_start as called. If | |
187 | * not then we may need to wrap qc_issue. | |
188 | */ | |
85cd7251 | 189 | |
669a5db4 JG |
190 | static void sl82c105_bmdma_stop(struct ata_queued_cmd *qc) |
191 | { | |
192 | struct ata_port *ap = qc->ap; | |
193 | ||
194 | ata_bmdma_stop(qc); | |
195 | sl82c105_reset_engine(ap); | |
8361cd79 | 196 | udelay(100); |
85cd7251 | 197 | |
669a5db4 JG |
198 | /* This will redo the initial setup of the DMA device to matching |
199 | PIO timings */ | |
16728da9 | 200 | sl82c105_set_piomode(ap, qc->dev); |
669a5db4 JG |
201 | } |
202 | ||
92ba5d02 AC |
203 | /** |
204 | * sl82c105_qc_defer - implement serialization | |
205 | * @qc: command | |
206 | * | |
207 | * We must issue one command per host not per channel because | |
208 | * of the reset bug. | |
209 | * | |
210 | * Q: is the scsi host lock sufficient ? | |
211 | */ | |
212 | ||
213 | static int sl82c105_qc_defer(struct ata_queued_cmd *qc) | |
214 | { | |
215 | struct ata_host *host = qc->ap->host; | |
216 | struct ata_port *alt = host->ports[1 ^ qc->ap->port_no]; | |
217 | int rc; | |
218 | ||
219 | /* First apply the usual rules */ | |
220 | rc = ata_std_qc_defer(qc); | |
221 | if (rc != 0) | |
222 | return rc; | |
223 | ||
224 | /* Now apply serialization rules. Only allow a command if the | |
225 | other channel state machine is idle */ | |
226 | if (alt && alt->qc_active) | |
227 | return ATA_DEFER_PORT; | |
228 | return 0; | |
229 | } | |
230 | ||
669a5db4 | 231 | static struct scsi_host_template sl82c105_sht = { |
68d1d07b | 232 | ATA_BMDMA_SHT(DRV_NAME), |
669a5db4 JG |
233 | }; |
234 | ||
235 | static struct ata_port_operations sl82c105_port_ops = { | |
029cfd6b TH |
236 | .inherits = &ata_bmdma_port_ops, |
237 | .qc_defer = sl82c105_qc_defer, | |
669a5db4 JG |
238 | .bmdma_start = sl82c105_bmdma_start, |
239 | .bmdma_stop = sl82c105_bmdma_stop, | |
029cfd6b TH |
240 | .cable_detect = ata_cable_40wire, |
241 | .set_piomode = sl82c105_set_piomode, | |
a1efdaba | 242 | .prereset = sl82c105_pre_reset, |
85cd7251 | 243 | }; |
669a5db4 JG |
244 | |
245 | /** | |
246 | * sl82c105_bridge_revision - find bridge version | |
247 | * @pdev: PCI device for the ATA function | |
248 | * | |
249 | * Locates the PCI bridge associated with the ATA function and | |
250 | * providing it is a Winbond 553 reports the revision. If it cannot | |
251 | * find a revision or the right device it returns -1 | |
252 | */ | |
85cd7251 | 253 | |
669a5db4 JG |
254 | static int sl82c105_bridge_revision(struct pci_dev *pdev) |
255 | { | |
256 | struct pci_dev *bridge; | |
669a5db4 JG |
257 | |
258 | /* | |
259 | * The bridge should be part of the same device, but function 0. | |
260 | */ | |
261 | bridge = pci_get_slot(pdev->bus, | |
262 | PCI_DEVFN(PCI_SLOT(pdev->devfn), 0)); | |
263 | if (!bridge) | |
264 | return -1; | |
265 | ||
266 | /* | |
267 | * Make sure it is a Winbond 553 and is an ISA bridge. | |
268 | */ | |
269 | if (bridge->vendor != PCI_VENDOR_ID_WINBOND || | |
270 | bridge->device != PCI_DEVICE_ID_WINBOND_83C553 || | |
271 | bridge->class >> 8 != PCI_CLASS_BRIDGE_ISA) { | |
272 | pci_dev_put(bridge); | |
273 | return -1; | |
274 | } | |
275 | /* | |
276 | * We need to find function 0's revision, not function 1 | |
277 | */ | |
669a5db4 | 278 | pci_dev_put(bridge); |
44c10138 | 279 | return bridge->revision; |
669a5db4 JG |
280 | } |
281 | ||
85cd7251 | 282 | |
669a5db4 JG |
283 | static int sl82c105_init_one(struct pci_dev *dev, const struct pci_device_id *id) |
284 | { | |
1626aeb8 | 285 | static const struct ata_port_info info_dma = { |
1d2808fd | 286 | .flags = ATA_FLAG_SLAVE_POSS, |
669a5db4 JG |
287 | .pio_mask = 0x1f, |
288 | .mwdma_mask = 0x07, | |
289 | .port_ops = &sl82c105_port_ops | |
290 | }; | |
1626aeb8 | 291 | static const struct ata_port_info info_early = { |
1d2808fd | 292 | .flags = ATA_FLAG_SLAVE_POSS, |
669a5db4 JG |
293 | .pio_mask = 0x1f, |
294 | .port_ops = &sl82c105_port_ops | |
295 | }; | |
1626aeb8 TH |
296 | /* for now use only the first port */ |
297 | const struct ata_port_info *ppi[] = { &info_early, | |
92ba5d02 | 298 | NULL }; |
669a5db4 JG |
299 | u32 val; |
300 | int rev; | |
f08048e9 TH |
301 | int rc; |
302 | ||
303 | rc = pcim_enable_device(dev); | |
304 | if (rc) | |
305 | return rc; | |
669a5db4 JG |
306 | |
307 | rev = sl82c105_bridge_revision(dev); | |
85cd7251 | 308 | |
669a5db4 JG |
309 | if (rev == -1) |
310 | dev_printk(KERN_WARNING, &dev->dev, "pata_sl82c105: Unable to find bridge, disabling DMA.\n"); | |
311 | else if (rev <= 5) | |
312 | dev_printk(KERN_WARNING, &dev->dev, "pata_sl82c105: Early bridge revision, no DMA available.\n"); | |
1626aeb8 TH |
313 | else |
314 | ppi[0] = &info_dma; | |
85cd7251 | 315 | |
669a5db4 JG |
316 | pci_read_config_dword(dev, 0x40, &val); |
317 | val |= CTRL_P0EN | CTRL_P0F16 | CTRL_P1F16; | |
318 | pci_write_config_dword(dev, 0x40, val); | |
319 | ||
9363c382 | 320 | return ata_pci_sff_init_one(dev, ppi, &sl82c105_sht, NULL); |
669a5db4 JG |
321 | } |
322 | ||
2d2744fc JG |
323 | static const struct pci_device_id sl82c105[] = { |
324 | { PCI_VDEVICE(WINBOND, PCI_DEVICE_ID_WINBOND_82C105), }, | |
325 | ||
326 | { }, | |
669a5db4 JG |
327 | }; |
328 | ||
329 | static struct pci_driver sl82c105_pci_driver = { | |
330 | .name = DRV_NAME, | |
331 | .id_table = sl82c105, | |
332 | .probe = sl82c105_init_one, | |
333 | .remove = ata_pci_remove_one | |
334 | }; | |
335 | ||
336 | static int __init sl82c105_init(void) | |
337 | { | |
338 | return pci_register_driver(&sl82c105_pci_driver); | |
339 | } | |
340 | ||
669a5db4 JG |
341 | static void __exit sl82c105_exit(void) |
342 | { | |
343 | pci_unregister_driver(&sl82c105_pci_driver); | |
344 | } | |
345 | ||
669a5db4 JG |
346 | MODULE_AUTHOR("Alan Cox"); |
347 | MODULE_DESCRIPTION("low-level driver for Sl82c105"); | |
348 | MODULE_LICENSE("GPL"); | |
349 | MODULE_DEVICE_TABLE(pci, sl82c105); | |
350 | MODULE_VERSION(DRV_VERSION); | |
351 | ||
352 | module_init(sl82c105_init); | |
353 | module_exit(sl82c105_exit); |